Improvement in india-rubber fabrics



UNITED STATES PATENT O FICE.

n. E. MAROY, on NEW YORK, N. Y.

Specification forming part of Letters Patent No. 26,360, dated December 6, 1859.

To all whom it may concern:

Be it known that I, E. E. MARCY, of the city of New York, in the State of New York, have invented a new and improved fabric or compound of indie-rubber which will cause it to retain permanent elasticity and withstand changes of temperature and emit no unpleasant odor; and I declare the following is a true description of the same.

The nature of my invention consists in producing a new fabric by the combination of hyposulphite of zinc and sulphuret of zinc with india-rubber or caoutchoucand submittingthe compound thus formed to the action of heat. I combine these articles with indiarubber in the following proportions, which are the best known to me. although they may be varied with good results:

To two parts of rubber I add one part of sulphuret of zinc and one part of hyposulphite of zinc, by weight, and mix or unite the compound by passing the same through the heated rollers or grinders now generally used in preparing and manufacturing india-rubber. After the mixture is thoroughly combined by grinding it may be spread upon cloth or rolled into sheets, or put into any other required form for use. .It should then be subjected to the action of steam or water at a high temperature by being placed in a vessel containing steam or water at a heat from 24:0 to350 Fahrenheit, or containing water or water and steam at the same high temperature.

It may be necessary for the thorough curing of some articles to increase the temperature to 4.00 and upward; but the degree of temperature and the length of time that the compound must be submitted to the heatwill depend, to a certain extent, upon the size and quality of the fabric, but the temperature will in no case be carried so high as to liberate sulphur from the compounds of zinc before described.

The application of heat by means of steam or hot water may be made by any of the wellknown processes in themanufacture of indiarubber, and must be made by such means, as the compound will not cure satisfactorily in dry air at any temperature.

Other substances may be mixed and ground up with the compound for the purpose of increasing its bulk and hardening it and for giving the fabrics other qualities well known to india-rubber manufacturers; but such articles have no effect in producing the result I have described. Such ingredients are well known to manufacturers of indie-rubber, and may be used in connection with my discovery. The sulphate or sulphite of zinc may be used with a good result,instead of the sulphuret, in combination with the hyposulphite in the proportions hereinbefore indicated.

' The goods manufactured by my process are of a white color, and the new fabric or compound possesses many valuable properties which are not found in the goods cured by the processes of Goodyear and Hancock.

I do not claim the process of Charles Goodyear as set forth in his original patent of June 15, 1844, and reissued December 25, 1849, nor the process described iuthe patent of J. T. Trotter, December 3, 1850, or in the reissued patent of Tyer and Helm, dated May, 1859, nor the curing of india-rubber as specified in the patent of John Ryder, of June 1, 1852, for

treating guttapercha; but

What 1 do claim as my invention, and de sire to secure by Letters Patent, is-

The improved india-rubber fabric made by the combination of india-rubber with the sulphuret of zinc and hyposulphiteof zinc and by the exposure of said compound to steam or water at the temperature hereinbefore stated, substantially as described, without any admixture of free sulphur.

E. E. MARGY.

Witnesses:

W. J. A. FULLER, JOHN A. SCONGIA. 

